CN108706674B - Supergravity enhanced extraction of-O3/Fe2+Method and device for treating high-concentration nitrobenzene wastewater by using method - Google Patents

Supergravity enhanced extraction of-O3/Fe2+Method and device for treating high-concentration nitrobenzene wastewater by using method Download PDF

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CN108706674B
CN108706674B CN201810350379.7A CN201810350379A CN108706674B CN 108706674 B CN108706674 B CN 108706674B CN 201810350379 A CN201810350379 A CN 201810350379A CN 108706674 B CN108706674 B CN 108706674B
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CN108706674A (en
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焦纬洲
刘有智
杨鹏飞
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North University of China
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Abstract

The invention belongs to the technical field of nitrobenzene wastewater treatment, provides supergravity enhanced extraction-O for solving the defects of the existing method for treating nitrobenzene wastewater3/Fe2+A method and a device for treating high-concentration nitrobenzene wastewater by using the method. Treating high-concentration nitrobenzene waste water by using an extraction method to reduce the concentration of nitrobenzene in the waste water, and then adopting O3/Fe2+The method further processes the waste water to reach the emission standard; the concentration of nitrobenzene in the high-concentration nitrobenzene wastewater is 1000-2000 mg/L, and the adopted extracting agent is cyclohexane, compared with VCyclohexane：VWaste waterThe ratio of the water to the liquid is 1: 2-2: 1, the pH is 5-9, the temperature is 25 ℃, and the liquid flow is 40-60L/h. The efficiency is improved by 20 to 30 percent, the time is shortened by 30 to 40 percent, and the water treatment cost is reduced. The process flow is simple, the operation is convenient, and the method can be applied to various organic industrial wastewater such as explosive wastewater, phenol-containing wastewater, dye wastewater, medical wastewater and the like.

Description

Supergravity enhanced extraction of-O3/Fe2+Method and device for treating high-concentration nitrobenzene wastewater by using method
Technical Field
The invention belongs to the technical field of nitrobenzene wastewater treatment, and particularly relates to a process method for treating high-concentration nitrobenzene wastewater, which adopts the combined action of a supergravity technology and an extraction and catalytic ozonation technology.
Background
Nitrobenzene is commonly used as an organic synthesis intermediate and is widely applied to industries such as chemical industry, fuels, materials, coking and the like. However, the substituent nitro in the nitrobenzene is an electron-withdrawing group, has stable chemical properties, is not easily biodegraded, and can stably exist in water. Once entering the environment, the animal nervous system abnormal symptoms, anemia, liver diseases and the like can be caused, and one of 68 key pollutants is listed in China.
At present, domestic methods for treating the wastewater mainly comprise a physical method, a chemical method and a biological method. When the physical method is used for treating the wastewater containing nitrobenzene, nitrobenzene is only transferred from one phase to the other phase, and nitrobenzene is not changed. For the beginningThe nitrobenzene-containing wastewater with higher initial concentration is treated by a physical method, so that the concentration of nitrobenzene in the wastewater can be reduced, part of nitrobenzene can be recycled, and the maximum resource utilization is realized. The extraction method has the advantages of low energy consumption, large water treatment amount, simple equipment, safe operation and the like, is widely used for recycling the benzene ring-containing compound, but is easy to cause secondary pollution due to improper selection of an extracting agent for the extraction method; the extraction is carried out in the traditional extraction tower or stirring oscillation, and the problems of large liquid drop diameter, slow movement speed, small turbulence degree, small mass transfer driving force in the liquid-liquid extraction process, low mass transfer coefficient, low extraction level efficiency and the like exist. The chemical method is to convert organic matter difficult to degrade into easily degradable matter based on the electron gain and loss condition in the chemical reaction process. Among them, ozone is widely used in the treatment of drinking water and sewage because of its strong sterilizing ability, no secondary pollution, etc. The oxidation of organic substances by ozone has two ways: (1) ozone is directly used for organic matter reaction; (2) ozone is decomposed into OH with stronger oxidizing power, and the OH is nonselective and reacts with organic matters rapidly. However, some problems still exist with ozonization technology, such as: (1) the direct oxidation reaction of ozone has high selectivity, low reaction rate with organic matters and low mineralization degree to the organic matters. In order to solve or improve the problem, researchers improve ozone, namely, a catalytic ozonization technology is used for generating more OH, increasing the generation of indirect reaction in oxidation and degrading organic pollutants in water. According to different catalysts, heterogeneous catalysis ozonization technology and homogeneous catalysis ozonization technology can be respectively adopted. Wherein the homogeneous catalytic ozonation technique (commonly used catalyst is H)2O2Transition metal ion (Fe)2+、Mn2+、Ti4+、H2O2) Etc.) has been widely studied due to the advantages of mild reaction conditions, high oxidation efficiency, no need for catalyst preparation, etc. (2) The addition of the catalyst improves the degradation efficiency of organic matters, but the step of controlling the rate of wastewater degradation is mass transfer of ozone at a gas-liquid interface, and the solubility of ozone in water is low, which still limits the application of ozone. Supergravity technique with rotating packed bed (rotation)packed bed, RPB) as a carrier, realizing a supergravity environment on the earth. The liquid is cut into liquid film, liquid silk and liquid drop, which enlarges the interphase surface, and the gas-liquid interphase surface is updated rapidly, which greatly strengthens the mass transfer process. Guo Liang and the like carry out research on the mass transfer performance of ozone in a high gravity field, and the results show that the dissolution rate of ozone is obviously improved, and K in rotary packed bed equipmentLThe value a is K in the traditional aeration reaction deviceLThe value of a is 2.5 times. Meanwhile, for high-concentration nitrobenzene wastewater, the separate use of various methods has problems of poor treatment effect, high treatment cost and the like.
Fe2+Catalytic O3The mechanism is as follows:
Figure 923687DEST_PATH_IMAGE001
control step
Figure 903144DEST_PATH_IMAGE002
Figure 682882DEST_PATH_IMAGE003
Figure 891140DEST_PATH_IMAGE004
k=0.09L/(mol·s)
Figure 705512DEST_PATH_IMAGE005
k=3.9×109L/(mol·s)。
Disclosure of Invention
The invention provides supergravity enhanced extraction-O for solving the defects of the existing method for treating nitrobenzene wastewater3/Fe2+A process and a device for treating high-concentration nitrobenzene wastewater by a method.
The invention is realized by adopting the following technical scheme:
chemical industry for treating high-concentration nitrobenzene wastewaterThe method comprises the following steps: reducing high-concentration nitrobenzene waste water to a certain concentration by using an extraction method, and then adopting O3/Fe2+The method further processes the waste water to reach the emission standard. The concentration of nitrobenzene in the wastewater is 1000 mg/L-2000 mg/L, and the adopted extracting agent is cyclohexane compared with (V)Cyclohexane：VWaste water) The ratio of the water to the organic solvent is 1: 2-2: 1, the pH value is 5-9, the temperature is 25 ℃, and the liquid flow is 40L/h-60L/h.
The device for treating the high-concentration nitrobenzene wastewater comprises liquid-liquid mass transfer equipment, wherein a liquid inlet, a liquid outlet, a nozzle, a motor, a shell and a rotor are arranged on the liquid-liquid mass transfer equipment. The liquid in the liquid storage tank is connected with the liquid inlet through the liquid flowmeter under the action of the pump, and the liquid outlet is connected with the liquid separator. The liquid separator is provided with a light liquid outlet and a heavy liquid outlet.
The liquid-liquid mass transfer equipment IS an impinging stream-rotating packed bed (IS-RPB), stainless steel wire mesh packing IS arranged in the rotor, the diameter of the stainless steel wire mesh packing IS 0.275mm, the inner diameter and the outer diameter of the stainless steel wire mesh packing are 60mm and 160mm respectively, the axial height of the stainless steel wire mesh packing IS 60mm, and the rotating speed of the liquid-liquid mass transfer equipment IS 300-500 r/min. The diameter of the nozzle is 1.5mm, and the initial impact speed is 6.3-9.45 m/s.
The concentration of nitrobenzene in the extracted wastewater is 62.49 mg/L-125.85 mg/L, and the COD is 120.96 mg/L-227.51 mg/L.
O3/Fe2+The concentration of nitrobenzene treated by the method is 62.49 mg/L-125.85 mg/L, Fe2+The concentration is 0.2 mmol/L-0.6 mmol/L, the ozone concentration is 28 mg/L-44 mg/L, the pH is 1.5-5.5, the temperature is 25 ℃, the liquid flow is 80L/h-160L/h, and the gas flow is 30L/h-50L/h.
The device for treating the nitrobenzene wastewater comprises gas-liquid mass transfer equipment, wherein the gas-liquid mass transfer equipment is provided with a rotor, a liquid inlet, a gas inlet, a liquid outlet, a gas outlet, a liquid distributor and a motor. The liquid in the raffinate phase storage tank is connected with a liquid inlet through a liquid flow meter under the action of a pump and enters the rotor through a liquid distributor. The pure oxygen passes through the ozone generator from the steel bottle, is connected with the gas inlet after passing through the gas flowmeter, and the gas outlet is connected with the KI solution storage tank.
The gas-liquid mass transfer device is a Rotary Packed Bed (RPB), stainless steel wire mesh packing is arranged in the rotor, the diameter of the stainless steel wire mesh packing is 0.275mm, the inner diameter and the outer diameter of the stainless steel wire mesh packing are 60mm and 160mm respectively, the axial height of the stainless steel wire mesh packing is 60mm, and the hypergravity factor beta of the stainless steel wire mesh packing is 40-120.
RPB-O3/Fe2+The concentration of nitrobenzene in the wastewater treated by the method is 0.28 mg/L-12.86 mg/L, and the COD is 28.6 mg/L-62.24 mg/L.
The invention adopts the supergravity technology to strengthen the extraction-catalytic ozonization technology to jointly treat the high-concentration nitrobenzene wastewater, so that the high-concentration nitrobenzene wastewater can obtain better treatment effect in a short time. Compared with the prior art, the treatment efficiency is improved by 20-30%, the time is shortened by 30-40%, and the water treatment cost is greatly reduced.
The invention has the following beneficial effects: the process flow is simple, the operation is convenient, the hypergravity technology and the extraction-catalytic ozonation technology are combined, the problems in the prior art are solved, the water treatment cost is reduced, and the method can be applied to various organic industrial wastewater such as explosive wastewater, phenol-containing wastewater, dye wastewater, medical wastewater and the like.
Drawings
FIG. 1 is a process flow diagram for treating high-concentration nitrobenzene wastewater by an extraction method;
FIG. 2 is a schematic diagram of a liquid distributor;
FIG. 3 is a schematic diagram of an impinging stream-rotating packed bed configuration;
FIG. 4 shows RPB-O3/Fe2+Process flow chart of the method for treating raffinate phase.
Fig. 5 is a schematic diagram of a rotating packed bed structure.
In the figure: 1-liquid storage tank I, 2-liquid pump I, 3-liquid flowmeter I, 4-liquid pump II, 5-liquid flowmeter II, 6-liquid mass transfer equipment, 7-liquid storage tank II, 8-mixed clarification tank, 9-pure oxygen steel cylinder, 10-ozone generator, 11-gas flowmeter, 12-gas-liquid mass transfer equipment, 13-liquid flowmeter III, 14-liquid pump III, 15-raffinate storage tank, 16-KI solution storage tank
6.1-impinging stream-rotating packed bed liquid inlet, 6.2-impinging stream-rotating packed bed liquid outlet, 6.3-nozzle, 6-4 motor I, 6.5-shell, 6.6-impinging stream-rotating packed bed rotor
8.1-light liquid outlet, 8.2-heavy liquid outlet
12.1-rotor of rotary packed bed, 12.2-gas inlet of rotary packed bed, 12.3-liquid distributor, 12.4-liquid inlet of rotary packed bed, 12.5-liquid outlet of rotary packed bed, 12.6-gas outlet of rotary packed bed, and 12.7-motor II.
Detailed Description
The embodiments of the present invention will be further explained with reference to the drawings.
A process method for treating high-concentration nitrobenzene wastewater comprises the following steps: reducing the high-concentration nitrobenzene waste water to a certain concentration by using an extraction method, and then adopting RPB-O3/Fe2+The method further processes the waste water to reach the emission standard.
As shown in figure 1, figure 2 and figure 3, the process method and the device for treating the high-concentration nitrobenzene wastewater by the extraction method comprise the following steps: nitrobenzene wastewater and cyclohexane are respectively placed in a storage tank I1 and a storage tank II 7, and the liquid respectively enters an impinging stream-rotating packed bed 6 after passing through a rotor flow meter I3 and a rotor flow meter II 5 under the action of a pump I2 and a pump II 4. After entering the impinging stream-rotating packed bed 6, the two liquids firstly pass through the nozzle 6.3, and the two liquids impinge oppositely to form an impinging mist surface vertical to the flowing direction of the original fluid, so that the surface area of the liquid is increased, the surface renewal is promoted, and the transfer rate is increased. The fog face formed by the impact enters a rotor 6.6 of an impact flow-rotating packed bed 6, and is sheared into liquid microelements (liquid films, liquid lines, liquid threads or liquid drops) by the rotating packing, the liquid microelements can continuously and rapidly undergo multiple coagulation and dispersion processes, the liquid-liquid mass transfer driving force is increased, the mass transfer coefficient is improved, and the extraction efficiency is greatly increased. And finally, the liquid is thrown onto the shell 6.5 and enters the liquid separator 8 through the liquid outlet 6.2 under the action of gravity, and the raffinate phase flows out of the heavy liquid outlet 8.2, so that the content of nitrobenzene in the wastewater is greatly reduced.
As shown in fig. 4 and 5, RPB-O3/Fe2+The process and the device for treating raffinate phase wastewater by the method comprise the following steps: pure oxygen in the steel cylinder 9 generates ozone/oxygen mixed gas with certain concentration through an ozone generator 10, the ozone/oxygen mixed gas is metered through a gas flowmeter 11 and then enters a rotary packed bed 12, and the pure oxygen passes through a packing in the axial direction. Mixing Fe2+Dissolved in raffinate phase, placed in a raffinate phase storage tank 15 and enters the rotary packed bed 12 through a liquid flow meter III 13 under the circulating action of a pump III 14. The liquid is sprayed on the inner edge of the rotor 12.1 through the liquid distributor 12.3, the filled inner edge is thrown out along the radial direction, liquid microelements (liquid films, liquid lines, liquid threads or liquid drops) are cut by the liquid filled in the process and are in cross flow contact with ozone gas containing a certain concentration, and the mass transfer and oxidation reaction of the ozone are completed and strengthened. The liquid is thrown to the housing and flows from the liquid outlet 12.5 back to the raffinate storage tank 15 for circulation. Unreacted ozone gas enters the KI solution storage tank 16 and is absorbed by the KI solution.
The following further describes embodiments of the present invention with reference to specific examples.
Example 1: the extraction method is used for treating 1L nitrobenzene wastewater with the concentration of 1000 mg/L. Respectively placing the prepared nitrobenzene wastewater and the extracting agent cyclohexane into two liquid storage tanks, wherein the liquid storage tanks are in phase ratio (V)Cyclohexane：VWaste water) 1:2, rotating speed N =500r/min, waste water flow Qa=60L/h, pH =5, temperature T =25 ℃, and a cross-flow extraction was carried out once in an impinging stream-rotating packed bed at an initial impinging velocity of 9.45m/s for the two liquids. The result shows that the nitrobenzene content in the waste water (raffinate phase) is reduced to 62.49mg/L, the nitrobenzene removal rate reaches 93.75 percent, and the extraction-grade efficiency is 98.18 percent. Under similar experimental conditions, extraction experiments are carried out in an impinging stream extractor, the nitrobenzene removal rate is 81.68%, the extraction-grade efficiency is 83.33%, and the nitrobenzene removal rate is reduced by 12.07% and 14.85% respectively compared with that of an impinging stream-rotating packed bed. Using RPB-O3/Fe2+Further processing the raffinate phase solution (C)NB=62.49mg/L, COD =120.96 mg/L). At pH =5.5, hypergravity factor β =40, T =25 ℃, liquid flow Qa=80L/h, iron ion concentration CFe 2+=0.2mmol/L, gas flow rate QG=30L/h, ozone mass concentration CO3=28mg/L, circulating for 30min, rotating Fe in packed bed2+Catalytic O3Oxidizing and degrading organic matters (RPB-O) in raffinate phase3/Fe2+) After treatment, the nitrobenzene content was 12.86mg/L and COD =39.76 mg/L. Fe was carried out in a conventional bubble reactor under similar experimental conditions2+Catalytic O3Oxidation degradation of organic matters in raffinate phase (BR-O)3/Fe2 +）。RPB-O3/Fe2+And BR-O3/Fe2+Compared with the prior art, the removal rate of nitrobenzene is improved by 22.8 percent, and the removal rate of COD is improved by 27.25 percent.
Example 2: the extraction method is used for treating 1L nitrobenzene wastewater with the concentration of 1500 mg/L. Respectively placing the prepared nitrobenzene wastewater and the extracting agent cyclohexane into two liquid storage tanks, wherein the liquid storage tanks are in phase ratio (V)Cyclohexane：VWaste water) 1:1, rotating speed N =400r/min, waste water flow Qa=50L/h, pH =7, temperature T =25 ℃, and a cross-flow extraction was carried out once in an impinging stream-rotating packed bed at a two-liquid impinging initial velocity of 7.88 m/s. The result shows that the nitrobenzene content in the waste water (raffinate phase) is reduced to 75.06mg/L, the nitrobenzene removal rate reaches 94.93%, and the extraction-grade efficiency is 99.99%. Under similar experimental conditions, extraction experiments are carried out in an impinging stream extractor, the nitrobenzene removal rate is 80.88%, the extraction grade efficiency is 82.03%, and the nitrobenzene removal rate is reduced by 14.05% and 17.96% respectively compared with that of an impinging stream-rotating packed bed. Using RPB-O3/Fe2+Further processing the raffinate phase solution (C)NB=76.05mg/L, COD =139.9 mg/L). At pH =3.5, hypergravity factor β =80, T =25 ℃, liquid flow Qa=120L/h, iron ion concentration CFe 2+=0.4mmol/L, gas flow rate QG=40L/h, ozone mass concentration CO3=36mg/L, circulating for 30min, rotating Fe in packed bed2+Catalytic O3Oxidizing and degrading organic matters (RPB-O) in raffinate phase3/Fe2+) After treatment, the nitrobenzene content was only 0.28mg/L, and COD =28.6 mg/L. Fe was carried out in a conventional bubble reactor under similar experimental conditions2+Catalytic O3Oxidation degradation of organic matters in raffinate phase (BR-O)3/Fe2 +）。RPB-O3/Fe2+And BR-O3/Fe2+Compared with the prior art, the removal rate of nitrobenzene is improved by 25.3 percent, and the removal rate of COD is improved by 31.34 percent.
Example 3: the extraction method is used for treating 1L of nitrobenzene wastewater with the concentration of 2000 mg/L. Respectively placing the prepared nitrobenzene wastewater and the extracting agent cyclohexane into two liquid storage tanksIn phase ratio (V)Cyclohexane：VWaste water) 2:1, rotating speed N =300r/min, waste water flow Qa=40L/h, pH =9, temperature T =25 ℃, and a cross-flow extraction was carried out once in an impinging stream-rotating packed bed at an initial impinging velocity of 6.3m/s for the two liquids. The result shows that the nitrobenzene content in the wastewater (raffinate phase) is reduced to 125.85mg/L, the nitrobenzene removal rate reaches 93.71%, and the extraction-grade efficiency is 98.68%. Under similar experimental conditions, extraction experiments are carried out in an impinging stream extractor, the nitrobenzene removal rate is 79.43 percent, the extraction-grade efficiency is 81.56 percent, and the nitrobenzene removal rate is reduced by 14.28 percent and 17.12 percent respectively compared with that of an impinging stream-rotating packed bed. Using RPB-O3/Fe2+Further processing the raffinate phase solution (C)NB=125.85mg/L, COD =227.51 mg/L). At pH =1.5, hypergravity factor β =120, T =25 ℃, liquid flow Qa=160L/h, iron ion concentration CFe 2+=0.6mmol/L, gas flow rate QG=50L/h, ozone mass concentration CO3=44mg/L, circulating for 30min, rotating Fe in packed bed2+Catalytic O3Oxidizing and degrading organic matters (RPB-O) in raffinate phase3/Fe2+) After treatment, the nitrobenzene content was 7.85mg/L and COD =62.24 mg/L. Fe was carried out in a conventional bubble reactor under similar experimental conditions2+Catalytic O3Oxidation degradation of organic matters in raffinate phase (BR-O)3/Fe2+）。RPB-O3/Fe2+And BR-O3/Fe2+Compared with the prior art, the removal rate of nitrobenzene is improved by 21.2 percent, and the removal rate of COD is improved by 25.78 percent.

Claims (4)

1. Realize that hypergravity reinforces extraction-O3/Fe2+The method for treating the high-concentration nitrobenzene wastewater is characterized by comprising the following steps: treating high-concentration nitrobenzene wastewater by adopting a supergravity extraction method to reduce the concentration of nitrobenzene in the wastewater, and then adopting supergravity O3/Fe2 +The method further processes the waste water to reach the emission standard; the concentration of nitrobenzene in the high-concentration nitrobenzene wastewater is 1000mg/L to 2000mg/L, and the adopted extracting agent is cyclohexane, compared with VCyclohexane：VWaste water1: 2-2: 1, pH 5-9, temperature 25 ℃, liquid flow40L/h-60L/h;
the concentration of nitrobenzene in the extracted wastewater is 62.49 mg/L-125.85 mg/L, and the COD is 120.96 mg/L-227.51 mg/L;
O3/Fe2+the concentration of nitrobenzene treated by the method is 62.49 mg/L-125.85 mg/L, Fe2+The concentration is 0.2 mmol/L-0.6 mmol/L, the ozone concentration is 28 mg/L-44 mg/L, the pH is 1.5-5.5, the temperature is 25 ℃, the liquid flow is 80L/h-160L/h, and the gas flow is 30L/h-50L/h;
the adopted device comprises a liquid-liquid mass transfer device (6) and a gas-liquid mass transfer device (12), the liquid-liquid mass transfer device (6) is adopted for carrying out supergravity extraction, and the gas-liquid mass transfer device (12) is adopted for carrying out supergravity O3/Fe2+Catalyzing;
the liquid-liquid mass transfer equipment (6) is provided with a liquid inlet (6.1), a liquid outlet (6.2), a nozzle (6.3), a motor (6.4), a shell (6.5) and a rotor (6.6); the liquid storage tank I and the liquid storage tank II (7) are connected with a liquid inlet (6.1) through a liquid pump I (2), a liquid pump II (4), a liquid flow meter I (3) and a liquid flow meter II (5), and a liquid outlet (6.2) is connected with a mixed clarifying tank (8); the liquid-liquid mass transfer equipment (6) IS an impinging stream-rotating packed bed IS-RPB;
stainless steel wire mesh fillers are arranged in the impact flow-rotating packed bed IS-RPB rotor (6.6), the diameter of the stainless steel wire mesh fillers IS 0.275mm, the inner diameter and the outer diameter of the stainless steel wire mesh fillers are 60mm and 160mm respectively, the axial height of the stainless steel wire mesh fillers IS 60mm, and the rotating speed of the stainless steel wire mesh fillers IS 300-500 r/min; the diameter of the nozzle (6.3) is 1.5mm, and the initial impact speed is 6.3-9.45 m/s;
the gas-liquid mass transfer device (12) is a Rotary Packed Bed (RPB), stainless steel wire mesh packing is arranged in the rotor (12.1), the diameter of the stainless steel wire mesh packing is 0.275mm, the inner diameter and the outer diameter of the stainless steel wire mesh packing are 60mm and 160mm respectively, the axial height of the stainless steel wire mesh packing is 60mm, and the hypergravity factor beta is 40-120.
2. The method of claim 1 for realizing supergravity enhanced extraction-O3/Fe2+The method for treating the high-concentration nitrobenzene wastewater is characterized by comprising the following steps: the mixer-settler (8) is provided with a light liquid outlet (8.1) and a heavy liquid outlet (8.2).
3. The method of claim 1 for realizing supergravity enhanced extraction-O3/Fe2+The method for treating the high-concentration nitrobenzene wastewater is characterized by comprising the following steps: the gas-liquid mass transfer equipment (12) is provided with a rotor (12.1), a liquid inlet (12.4), a gas inlet (12.2), a liquid outlet (12.5), a gas outlet (12.6), a liquid distributor (12.3) and a motor (12.7); the raffinate phase storage tank (15) is connected with a liquid inlet (12.4) through a liquid pump III (14) and a liquid flowmeter III (13) and enters the rotor (12.1) through a liquid distributor (12.3); the pure oxygen steel cylinder (9) passes through the ozone generator (10), is connected with the gas inlet (12.2) after passing through the gas flowmeter (11), and the gas outlet (12.6) is connected with the KI solution storage tank (16).
4. The method of claim 1 for realizing supergravity enhanced extraction-O3/Fe2+The method for treating the high-concentration nitrobenzene wastewater is characterized by comprising the following steps: RPB-O3/Fe2+The concentration of nitrobenzene in the wastewater treated by the method is 0.28 mg/L-12.86 mg/L, and the COD is 28.6 mg/L-62.24 mg/L.
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